Method and system for closing type Britten-Rankine combined cycle solar heat power generation

Abstract

The invention relates to a method and a system for closing type Britten-Rankine combined cycle solar heat power generation. The method and the system keep the advantages of liquid pressurization and closing type Britten cycle of a supercritical carbon dioxide tower-type solar heat power generation system, eliminate the shortcomings of too high pressure and too low supercritical temperature of the system; by using water as the working medium of the Britten cycle in the tower-type solar heat power generation system and property of liquid water as incompressible fluid and extremely good heat transfer performance characteristics, the pressurizing power consumption of the working medium of the solar Britten cycle is greatly reduced; the Rankine cycle at the bottom part is used for absorbing heat released by the closing type Britten cycle, and thereby a new pattern of the closing type Britten-Rankine combined cycle solar heat power generation with higher efficiency and better economical performance is formed.

Description

technical field [0001] The invention relates to a solar thermal power generation method and system, in particular to a closed Breton-Rankine combined cycle solar thermal power generation method and system. Background technique [0002] With the vigorous development of renewable energy utilization in the world, concentrated solar power (CSP) and photovoltaic solar power (PV) have developed rapidly. The use of solar photovoltaic power generation can only make use of light with a shorter wavelength, and the light with a longer wavelength is completely wasted, and the temperature of the battery increases, resulting in a decrease in the efficiency of the battery, while the use of solar thermal power generation can make full use of the entire wavelength Therefore, concentrating solar power (CSP) is gradually recognized, researched and valued by people. Compared with photovoltaic solar power (PV), concentrating solar power (CSP) has outstanding features such as large scale, high c...

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Problems solved by technology

But it also has certain disadvantages: due to the low critical temperature and high critical pressure of carbon dioxide, which are 31.05°C and 7.53MPa respectively, it is necessary to ensure that the circulating working medium is pressurized by liquid, and the outlet pressure of the Britton cycle should be controlled at 1146psi (ie 7.9MPa), so the supercritical carbon dioxide concentrating solar power generation system device must adopt higher operating pressure and lower condensation temperature, and the system can withstand high pressure

[0030] Therefore, how to solve the problems existing in the above-mentioned prior art, give full play to the advantages of high concentrating ratio and high temperature of tower solar energy, select a suitable tower solar heat absorbing working medium, expand the advantages of Cheng's cycle and HAT cycle, and overcome the problems of arrangement The disadvantage of high power consumption in gas compression of the Burton cycle, the establishment of a more efficient closed-circuit Breton cycle power generation mode has become a difficulty in research in this field

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